超声诊断仪的图像故障分析

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                    <section data-role="outer" label="Powered by gulangu"><section><section><p><br  /></p></section><section data-tools="gulangu" data-id="93196"><section><section><section><p><img src="image/20200927/36ef0083800a171969c6e5a5af262581_1.gif" /></p></section><section><section></section><section><section data-brushtype="text"><span>超声诊断仪的图像故障分析</span></section></section></section></section></section></section><p><br  /></p><p><br  /></p><section data-tools="gulangu" data-id="91718"><section data-role="paragraph"><section><section data-width="100%"><section><section data-role="square"></section><section data-width="100%"><section><section><section></section></section></section><section><p>有趣 有用 有态度<br  /></p><p>instering useful attitude</p></section><section><section><section></section></section></section></section></section></section></section></section></section><p><br  /></p><p><br  /></p><section data-tools="gulangu" data-id="93344"><section><section data-width="100%"><section><section><section data-width="96%"><section><section><section><p><span><strong><span>1.故障现象</span></strong></span></p></section></section></section></section></section></section><section><section><p><span>机器能够正常启动，在选用相控阵探头（FPA 2.5MHz）时，在图像区域没有始波，只有噪声，无法进行超声扫描诊断。再切换到线阵探头（FLA 10MHz），在图像区域有始波，但只有正常情况下的1/3左右，中、远场部分没有回波。增大增益，噪声随之增多，无法进行临床诊断。</span></p></section></section></section></section></section><section data-role="paragraph"><p><br  /></p></section><section data-role="paragraph"><p><p><img src="image/20200927/0ff98f00c068f854b87bb9b5ae9550ca_2.jpg" /></p></p></section><section data-role="paragraph"><p><br  /></p></section><section data-tools="gulangu" data-id="93161"><section data-id="us2339268"><section><p><img src="image/20200927/e73cc5d532e393f1f5ddd59f1308bf32_3.jpg" /></p></section></section></section><section data-role="paragraph"><p><br  /></p></section><section data-tools="gulangu" data-id="93344"><section><section data-width="100%"><section><section><section data-width="96%"><section><section><section><p><span><strong><span>2.分析检修</span></strong></span></p></section></section></section></section></section></section><section><section><p><span>根据故障现象分析判断，怀疑系统的超声发射部分存在故障。影响超声波的产生和发射的部件主要包括：探头、通道板、发射板、前端控制板和高压电源，因此需要逐步检查，进一步缩小故障范围。首先，检查探头是否正常。将探头拔下，插入另外一个插座，然后看探头的切换是否正常。经检查，探头的切换正常，故障现象依旧。这说明，探头、通道板这部分运行正常。接着，再检查发射脉冲触发信号，结果正常。当检测高压电源时，结果发现+/- 80V电源没有输出。这说明，高压电源存在故障。高压电源故障，将导致发射板无法产生超声波脉冲输出，也就无法有始波图像显示。</span></p></section></section></section></section></section><section data-tools="gulangu" data-id="86"><section><section>&nbsp;</section></section></section><section data-id="image-63525"><p><p><img src="image/20200927/9501e524119ab582fd4c96439f8dbdaa_4.jpg" /></p></p></section><section data-role="paragraph"><p><br  /></p></section><section data-tools="gulangu" data-id="93451"><section><section data-tools="gulangu" data-id="93161"><section data-id="us2339268"><section><p><img src="image/20200927/e73cc5d532e393f1f5ddd59f1308bf32_3.jpg" /></p></section></section></section></section></section><p><br  /></p><section data-tools="gulangu" data-id="93344"><section><section data-width="100%"><section><section><section data-width="96%"><section><section><section><p><span><strong><span>3.故障排除</span></strong></span></p></section></section></section></section></section></section><section><section><p><span>从机箱将高压电源模块取出，打开金属外壳，使用万用表进行检测发现，有两个保险管已经烧断，说明高压电源内部有短路故障。经过测量，发现有两个三极管发生短路击穿。更换同样规格的三极管和保险管，短路故障排除。将高压电源模块装入机器后，开机运行，系统恢复正常。</span></p></section></section></section></section></section><section data-role="paragraph"><p><br  /></p></section><section data-tools="gulangu" data-id="93321"><section><section data-width="10%"><p><img src="image/20200927/ed7658aaec5d3081aa19b28c78177db9_6.jpg" /></p></section></section></section><p><br  /></p><p><br  /></p><section><p><span><strong><span>【版权声明】：</span><span>本文由整理发布，资料源自网络，版权归全球医院网所有，转载请注明来源！</span></strong><br  /><br  /></span></p><p><br  /></p><section><p><img src="image/20200927/010bbbf278c3b6b7c95298b64d269c34_7.jpg" /></p><span><strong>微信ID：yxiubang</strong></span></section><section><span><strong><p><img src="image/20200927/be4e431d576ab6dd24e4c4ce62867ec0_8.jpg" /></p>长按左侧二维码关注</strong></span></section><p><br  /></p></section></section></section><p><br  /></p>